SB-634 parts cross reference

[CEMILTON]

Hello and tnx fer the BW on the following.  I recently acquired an SB-634
Station Console that works fine x-cept for the 10 minute timer.

Does anyone have cross reference info on the following parts:

                component                                     Heath #
Type

IC101 thru IC103       16pin DIP                          443-602
DD700
IC202 thru IC204        14pin DIP                         443-7
SN7490N
IC205                        14pin DIP                         443-44
SN7413N
Q19 and Q21              NPN transistors               417-801
MPS-A20

These are probably easy to substitute but I have very little "sand state" tech
info and at I am at a loss going into the testing/repair process.  Any help is
appreciated.

Tnx es 73

KF4LYF, chuck

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